Optical device, light source module and manufacturing method thereof, optical engine, and xr glasses

An optical device comprising:

• a substrate;
• and
• an optical function layer formed on a main surface of the substrate,
• wherein the optical function layer comprises:
• optical input ports respectively corresponding to a plurality of visible laser light sources and capable of receiving visible light emitted from the corresponding visible laser light source;
• input optical waveguides respectively connected to the optical input ports;
• optical branching portions respectively having an input portion connected to each input optical waveguide and two output portions;
• monitor optical waveguides respectively connected to one of the output portions of each optical branching portion;
• monitor ports respectively connected to the monitor optical waveguides and emitting monitoring light to the outside;
• first optical waveguides respectively connected to the other of the output portions of each optical branching portion;
• optical modulation portions respectively connected to the first optical waveguides;
• second optical waveguides respectively connected to the optical modulation portions;
• an optical multiplexing portion connected to the second optical waveguides;
• an output optical waveguide connected to the optical multiplexing portion;
• and
• an optical output port connected to the output optical waveguide and emitting light multiplexed by the optical multiplexing portion to the outside.